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→Sea Lice
'''Epidemiology'''
'''Epidemiology'''
*Largely found in salt water
*Most wild salmonids migrate to the sea for part of their life cycle
*Sealice numbers are low on wild salmonids (adults only)
*Sealice numbers are high on farmed salmonids (larvae and adults)
**90% prevalence
**Average of 5-10 sealice upon a single fish
**Most sealice found on dorsal fin, head and back and underside of tail and fins
**Adults survive for over 3 weeks
**Migration of larval stages can be up to 1km
**Larvae locate host by responding to changes in light and vibration
'''Pathogenesis'''
'''Pathogenesis'''
*Adults and larval stages are epidermal browsers
*Mouth tube of toothed ridges abrades fish epidermis
*Heavy infections leads to:
**Epidermal abrasion
**Haemorrhage
**Immunosuppression
**Decreased productivity
**Death
''Control'''
'''Control'''
*Ectoparasites
*Ectoparasites
*Hidden antigen vaccine
*Hidden antigen vaccine
*Wrasse which feed on sea lice
*Wrasse which feed on sealice
*Managment improvements
*Managment improvements